Phacoemulsification Vacuum Control via Flow Sensor Feedback
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Solution Overview
Problem
Current phacoemulsification systems with vacuum-based pumps face challenges in controlling fluid flow rates during occlusions, leading to post-occlusion surges that can cause eye trauma, as the vacuum level is tied to the pump's power and not effectively indicative of occlusions.
Innovation Solution
A system with a control unit that includes a microprocessor to monitor and adjust the vacuum level, using a foot pedal to control irrigation, aspiration, and ultrasonic power, with features like chamber stabilization that adjust vacuum levels and pulse patterns to manage occlusions dynamically, allowing for reduced manual input and minimized trauma.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If vacuum-based pumps are used to control fluid flow, then fluid flow rate can be controlled, but the vacuum level becomes tied to pump power and is not effectively indicative of occlusions
Solution Approach 1:
The patent introduces a flow sensor as an intermediary device that directly measures fluid flow rate in the aspiration line, independent of the vacuum-based pump's power level. This flow sensor provides accurate occlusion detection by monitoring actual flow conditions rather than inferring from vacuum level, resolving the contradiction between maintaining high fluid flow rate and achieving precise occlusion detection.
2Productivity
If vacuum level is increased to improve fluid flow, then aspiration efficiency improves, but the risk of post-occlusion surges increases
Solution Approach 1:
The patent implements a feedback control system where the flow sensor continuously monitors fluid flow rate and provides real-time feedback to the control unit. When an occlusion is detected (abnormal flow condition), the system automatically adjusts the vacuum level to prevent post-occlusion surges, allowing high aspiration efficiency during normal operation while dynamically reducing risk when occlusions occur.
Solution Approach 2:
The system dynamically adjusts vacuum levels based on real-time flow conditions rather than maintaining a fixed high vacuum level. This dynamic control allows the system to operate at high aspiration efficiency during normal conditions while automatically reducing vacuum pressure when occlusions are detected, thereby preventing post-occlusion surges and adapting to changing operational conditions.
3Device complexity
If manual monitoring and adjustment of vacuum levels is used, then system simplicity is maintained, but surgical time increases and human error is more likely
Solution Approach 1:
The patent implements a self-service automated system where the flow sensor and control unit continuously monitor fluid flow conditions and automatically adjust vacuum levels without requiring manual intervention from the surgeon. This maintains relative system simplicity while eliminating the time loss and human error associated with manual monitoring and adjustment during surgery.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively reduces the risk of post-occlusion surges by dynamically adjusting vacuum levels and flow rates, maintaining a stable anterior chamber and reducing surgical time and human error.
Implementation Method 1
The handpiece 10 includes a needle 15 at the distal tip (shown within the anterior chamber of the patient's eye 1) that is ultrasonically vibrated to emulsify the cataractous lens within the patient's eye 1
Implementation Method 2
the vacuum-based pump 60 can be a pneumatic pump (e.g., a venturi pump) that creates a pressure differential in a drainage cassette reservoir 65 that causes the fluid to be sucked from the aspiration line 45 into the drainage cassette reservoir 65
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The invention relates to systems and methods for controlling vacuum within phacoemulsification systems. The phacoemulsification system may include a handpiece having a needle. The needle is coupled to a power source configured to cause the needle to be ultrasonically vibrated during operation and an aspiration source. The system further includes a footpedal that defines a first position and a second position. The system also includes a computer program product operatively coupled to the handpiece and the footpedal, the computer program product having a computer-usable medium having a sequence of instructions which, when executed by a processor, causes said processor to execute a process that controls power from the power source and vacuum from the aspiration source applied to the handpiece. The process includes the steps of providing a vacuum at a first level to the handpiece when the footpedal is at the first position; providing power to the handpiece when the footpedal is at the second position; and reducing the vacuum to a second level when the footpedal transitions from the first position to the second position.